There's a lot of talking recently about DxOMark sensor tests.I am considering buying one of the Canon's telephoto lenses so I took a look at their tests (http://www.dxomark.com/index.php/Lenses/Camera-Lens-Database/Canon). I was utterly shocked when I saw the results. My question is are their resolution tests accurate? Canon 300mm 2.8IS II which is considered one of the sharpest canon lenses (in line with 135 f2.0) scored lower (49lp/mm) than 70-200 f2.8 IS II (52lp/mm), 50mm 1.4 (63lp/mm)etc. I used all of these lenses and I do realize that 50mm is super sharp at f/4, and I am comparing apples and oranges (short focal with telephoto) but for crying out loud If I spend 16 times more on 300mm I do expect it to be at least at sharp as 50mm f1.4 at f/4I went on line and googled all there is to google about DxoMark tests and I am really lost. To judge for myself I went to http://www.the-digital-picture.com/Reviews/ISO-12233-Sample-Crops.aspx?Lens=111 and compared ISO 12233 Chart 100% Crops and I have to say that 300mm seems to be sharper or at least as sharp as 50 1.4 at f/4 and a few other lenses.Can somebody please tell me: are these DxOMark tests right or not. Thank.you.

I used to own the mk1 version and I haven't before or after seen anything that is as crazy sharp at 2,8. The 200f2 maybe.. corner to corner is insanely good wide open. I can't really see how the mk2 can be that much sharper, but certainly not LESS sharp. If you don't find the 300 2.8 sharp, then nothing will ever seem sharp.

I never had a 300 2.8 from canon, but until about a month ago I had (used it for about 3-4 years) a 400 2.8 IS. I was also shooting with is successor the 400 2.8 IS II and I found it to be equally sharp. They were both giving superb results.

From my experience, shooting alot of those tested lenses (including the 135 2.0), I wouldn't give a second thought about DxO...

I am sure the new 300 2.8 is as good (at least) as the old one and I haven't met a single sports photographer that was unhappy about the performence of the version 1 (IS).

The Canon 300mm f/2.8 L is a superbly sharp lens. Even 'professional' testing websites can receive a 'dud' or 'softer' copy... eg SLRgear with their Canon 70-300mm L is definitely not nearly as sharp as the one I own.

I generally refer to photozone.de and the-digital-picture.com for lens reviews... I've found these to be the most thorough and consistent.

You shouldn't really compare a 300mm f2.8 prime with a 50mm f1.4 prime. While both (Canon) prime lenses, they are SO different. Comparing apples to oranges.. big time.

But if you get a decent copy of the Canon 300mm f2.8 - you should get great outcomes.

Happy photography!

Paul

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I'm not a brand-fanatic. What I do appreciate is using my 7D and 350D cameras along with a host of lenses & many accessories to capture quality photos, and share with friends.

IMO the DxO lens tests are complete nonsense - their results are completely opposite to any real world experience. If you want to check the quality of the 300mm f2.8 MKII just look at some real pictures taken with this lens (native resolution) and compare the details to lenses like the both canon 70-300mm offerings ... There is simply no real comparison in the amount of details the 300 f2.8 MKII is capable of. When looking at the ISO charts at "the digital picture" it also seems like the 300mm MKII is superior to all other Canon supertelephoto lenses including the new 400mm, 500mm and 600mm in sharpness, even if this is only by a relatively small margin.

I've been shooting professionally for 28 years now and the EF 300mm 2.8L IS II is the sharpest lens I have ever owned. I think even better than some of the Carl Zeiss lenses I had with my Hasselblad years ago.

PackLight

There's a lot of talking recently about DxOMark sensor tests.I am considering buying one of the Canon's telephoto lenses so I took a look at their tests (http://www.dxomark.com/index.php/Lenses/Camera-Lens-Database/Canon). I was utterly shocked when I saw the results. My question is are their resolution tests accurate? Canon 300mm 2.8IS II which is considered one of the sharpest canon lenses (in line with 135 f2.0) scored lower (49lp/mm) than 70-200 f2.8 IS II (52lp/mm), 50mm 1.4 (63lp/mm)etc. I used all of these lenses and I do realize that 50mm is super sharp at f/4, and I am comparing apples and oranges (short focal with telephoto) but for crying out loud If I spend 16 times more on 300mm I do expect it to be at least at sharp as 50mm f1.4 at f/4I went on line and googled all there is to google about DxoMark tests and I am really lost. To judge for myself I went to http://www.the-digital-picture.com/Reviews/ISO-12233-Sample-Crops.aspx?Lens=111 and compared ISO 12233 Chart 100% Crops and I have to say that 300mm seems to be sharper or at least as sharp as 50 1.4 at f/4 and a few other lenses.Can somebody please tell me: are these DxOMark tests right or not. Thank.you.

The lenses you mentioned aren't even the same class as the 300mm f/2.8.With comparisons like this it isn't hard to see why DxO scores have no credibility.

DB

If you rely solely on reviews like DxO, then you wouldn't buy any lenses at all (or you'd have just 2 Canon lenses in your bag - the 85mm 1.8 and the 70-200mm f4L). As Neuro is fond of saying, their individual tests may indeed be quite accurate and rigorous, but how they aggregate test scores to produce an overall score may only be described as a 'Black Box' technique (only they know the answer and they will not make public how they add up the test scores).

I never bothered with DxO and not because I am a Canon user. I simply believed that they just made interesting software products for lens correction (bundled with specific cameras). I have no opinion on their camera ratings (I learned a lot though in this forum by reading various debates). As far as lenses are concerned, I find this score silly at least. We do not get information about performance at specific f-stops, center, edges or corners, flare, vignetting, CA etc. When I need a lens review I check photozone.de and the-digital-picture. I will continue ignoring DxO for ratings (and I have all cameras I need for the moment). Isolated feature tests and comparisons could be interesting though.

If you rely solely on reviews like DxO, then you wouldn't buy any lenses at all (or you'd have just 2 Canon lenses in your bag - the 85mm 1.8 and the 70-200mm f4L). As Neuro is fond of saying, their individual tests may indeed be quite accurate and rigorous, but how they aggregate test scores to produce an overall score may only be described as a 'Black Box' technique (only they know the answer and they will not make public how they add up the test scores).

This is really starting to annoy me, as i use DXO software, almost exclusively, and i'm very pleased with it. but after a while of hearing and reading some of the silly things DXO says it makes me question what it is they are doing.